BLODEUWEDD
Not to that demon's son, whom Arthur erst,
For necromancy, at Caerleon, first
Graced greatly, Merlin,—not to him alone
Did those lost learnings of white magic, known
As sorcery and witchcraft, then belong.
Taliesin, now, hath told us in a song
Of one at Arvon, Math of Gwynedd; lord
Of some vague cantrevs of the North; whose sword